On the old server folders are chmod 755 and writeble.
On the new server folders are chmod 755 and unwriteble.

The new server demands 777 for folders to be writeble

How can I fix this without starting to chmod folders ?

Thanks
Bjorn

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Right, you must enable suPHP on your server in order to have directory permissions as 755 and writable. In order to enable suPHP, you need to compile Apache with /scripts/easyapache command and select the required option. Once complete, login to WHM and click on "Configure PHP and SuExec" and confirm that suPHP is set as the handler for PHP.